dialog: update to 1.3-20230209.

2023/02/09
+ install ".pc" files in the test-packages.
+ add pkg-config ".pc" file, for use with the development library.

2023/02/07
+ change shared-library configuration in test-packages to use the
  ABI version in the library filename to match its SONAME.
+ add sample scripts to test-packages, using new makefile rule
  "install-examples".
+ corrected cdialog*.install helper scripts in test-package for Debian
+ change ftp URLs in test-packages to https
+ updated configure script, e.g., for compiler-warning fixes.
+ updated fur.po, zh_TW.po from
http://translationproject.org/latest/dialog/

(fcambus)